Grid drive circuit having forward and reverse scanning functions

Abstract

The invention discloses a grid drive circuit having forward and reverse scanning functions. The grid drive circuit comprises a forward scanning pre-charge module, a reverse scanning pre-charge module, a pull-up module, a grid scanning signal maintenance module, a pull-up control node maintenance module, an auxiliary module, a clearing and resetting module and a bootstrap capacitor. According to the grid drive circuit, the forward and reverse scanning functions can be realized; the forward scanning pre-charge module can be used as the pull-down clearing module of a pull-up control node in reverse scanning, and the reverse scanning pre-charge module can be used as the pull-down clearing module of a pull-up control node in forward scanning; the pull-up control node maintenance module can perform maintenance in forward scanning and can also perform maintenance in reverse scanning; and the number of elements can be reduced by the design so as to reduce space to realize narrow frame design.

Description

technical field [0001] The invention relates to a gate drive circuit, in particular to a gate drive circuit with forward and reverse scanning functions. Background technique [0002] In some special applications, the liquid crystal display needs to have the function of forward and reverse scanning. For example, the display screen of the mobile phone screen can be displayed normally or upside down. Bottom-up scanning is also possible. Such as figure 1 Shown is the current mainstream gate drive circuit, which cannot perform reverse scanning. Because the maintenance module of the pull-up control node netAn in this circuit is controlled by the previous clock signal, if the reverse scan is performed, the pull-up control node netAn cannot be maintained; the pull-down clear module of the pull-up control node netAn uses the subsequent stage Gate scan signal G n+3 is controlled, and the pre-charge module uses the gate scan signal G of the previous stage n-2 For control, the cont...

AI Technical Summary

Problems solved by technology

like figure 1 Shown is the current mainstream gate drive circuit, which cannot perform reverse scanning

Because the maintenance module of the pull-up control node netAn in this circuit is controlled by the previous clock signal, if the reverse scan is performed, the pull-up control node netAn cannot be maintained; the pull-down clearing module of the pull-up control node netAn uses the subsequent stage Gate scan signal G n+3 is controlled, and the pre-charge module uses the gate scan signal G of the previous stage n-2 For control, the control signal is asymmetrical, and if reverse scanning is performed, the circuit cannot operate normally

Images